/**
 * This file is part of 1genia trampoline
 * Copyright (C) 2007-2008 1genia (contact@1genia.com)
 *
 * This library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; version 3 of the License. 
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details. 
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; see the file COPYING.TXT.  If not,
 * write to the Free Software Foundation, Inc., 51 Franklin Street,
 * Fifth Floor, Boston, MA 02110-1301, USA. 
 **/
package com.genia.toolbox.projects.toolbox_basics_project.spring.manager.impl;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;

import com.genia.toolbox.security.bean.Permission;
import com.genia.toolbox.basics.exception.technical.TechnicalException;
import com.genia.toolbox.projects.toolbox_basics_project.bean.model.Role;
import com.genia.toolbox.projects.toolbox_basics_project.bean.model.User;
import com.genia.toolbox.projects.toolbox_basics_project.spring.manager.GroupRoleManager;
import com.genia.toolbox.projects.toolbox_basics_project.spring.manager.PermissionManager;

/**
 * Implementation of {@link PermissionManager}.
 */
public class PermissionManagerImpl
    implements PermissionManager
{
  /**
   * the {@link GroupRoleManager} to use.
   */
  private GroupRoleManager groupRoleManager;

  /**
   * the {@link Set} of handled permissions.
   */
  private Set<Permission> permissions = new HashSet<Permission>();

  /**
   * the {@link Permission}s indexed by their names.
   */
  private Map<String, Permission> permissionsByName = new HashMap<String, Permission>();



  /**
   * returns the {@link Set} of {@link Permission}s.
   * 
   * @return the {@link Set} of {@link Permission}s
   * @see com.genia.toolbox.projects.toolbox_basics_project.spring.manager.PermissionManager#getPermissions()
   */
  public Set<Permission> getPermissions()
  {
    return permissions;
  }



  /**
   * returns the {@link Set} of {@link Permission}s described by their names.
   * 
   * @param permissions
   *          the names of the {@link Permission}s to retrieve
   * @return the {@link Set} of {@link Permission}s described by their names
   * @see com.genia.toolbox.projects.toolbox_basics_project.spring.manager.PermissionManager#getPermissions(java.util.Set)
   */
  public Set<Permission> getPermissions(Set<String> permissions)
  {
    Set<Permission> results = new TreeSet<Permission>();
    for (String permission : permissions) {
      final Permission permissionObject = getPermission(permission);
      if (permissionObject != null) {
        results.add(permissionObject);
      }
    }
    return results;
  }



  /**
   * setter for the permissions property.
   * 
   * @param permissions
   *          the permissions to set
   */
  public void setPermissions(Set<Permission> permissions)
  {
    this.permissions.clear();
    permissionsByName.clear();
    for (Permission permission : permissions) {
      if (permission.isDisplayable()) {
        this.permissions.add(permission);
        permissionsByName.put(permission.getAuthority(), permission);
      }
    }
  }



  /**
   * getter for the groupRoleManager property.
   * 
   * @return the groupRoleManager
   */
  public GroupRoleManager getGroupRoleManager()
  {
    return groupRoleManager;
  }



  /**
   * setter for the groupRoleManager property.
   * 
   * @param groupRoleManager
   *          the groupRoleManager to set
   */
  public void setGroupRoleManager(GroupRoleManager groupRoleManager)
  {
    this.groupRoleManager = groupRoleManager;
  }



  /**
   * returns the {@link Set} of {@link Permission}s that an user have.
   * 
   * @param user
   *          the {@link User} to retrieve the {@link Permission} for
   * @return the {@link Set} of {@link Permission}s that an user have
   * @throws TechnicalException
   *           if an error occured
   * @see com.genia.toolbox.projects.toolbox_basics_project.spring.manager.PermissionManager#getPermissions(com.genia.toolbox.projects.toolbox_basics_project.bean.model.User)
   */
  public Set<Permission> getPermissions(User user)
      throws TechnicalException
  {
    HashSet<String> permissions = new HashSet<String>();
    for (Role role : getGroupRoleManager().getRoles(user.getGroups())) {
      permissions.addAll(role.getPermissions());
    }
    return getPermissions(permissions);
  }



  /**
   * returns the {@link Permission}s described by its name.
   * 
   * @param permission
   *          the name of the {@link Permission}
   * @return the {@link Permission}s described by its name
   * @see com.genia.toolbox.projects.toolbox_basics_project.spring.manager.PermissionManager#getPermission(java.lang.String)
   */
  public Permission getPermission(String permission)
  {
    return permissionsByName.get(permission);
  }

}
